anderson



E. T. ANDERSON METHOD OF CURING CONCRETE Filed Aug. 28, 1950 /NVENTOR/ 'wun IMM BY m1. me

AJM-0 ATTORNEY Jan. 19, 1932.

1c, oi ommemie,

ma@ @E SU CGN@ Agipeeten le icgesi: w39. Serial No. 473,845.,

f has been seciii'cci iieceioose Toy irequeniii -We'fbiiig iiie soiiece of? 'che ieseshiy leid con crete, oi7 Toy coveii'og the coociese Wieii imi?- iep iieqiiezoiiy wetting iiie seme. iiiese. Loiioi* methods of cming; conoceis eie used Wsieia shoiiid be ieloeeieciy eppiieci the cenere@ o peifiofi oi from ic sevesi weeks, Wiizii bhe reso-ii; mi@ the ejeeeied of time cos-farcie may iiivoive consiciei- @bie en@ idee?.

` iiiipoiiemih o 'he i;- yen'ion fiieeoce sesicies im iiipoyed mefbhc oi cui-iig comcie'fe yviieeoy ie oeefi oii ee'sediy seeking 'che sii ce of che a "Foe 'oieseiie Sched is the moisture@ o2? 'which is oiso suiiciezscy sfsfong, diireiiie ci impevioiis io moisture 43o 'pro- *Jiie smi-ece oi' ishe ceiicieee end iis-eicit m g concrete curing ieeiuie iiie Weieyoo coyeiilig oi 'the p'feseiiis iiweii- Cioi is of @Timm importe-ece, the protection eofdefi iie "iesiiy iei concre'i'e by 'che covezimg is oise higiiiy fiesiiebie peieicuiariy im ooiiiiwiioii with the concieie loois of buiings, silice 7@bese oois may 'be suiijeoeed so heavy Mae and other injui'ioiisV oi'ces whiie 1die "building is being construced, end if isha oors are not pfoeoted they are likely to become soiled and discolored by the ieliiig conci'ee mixture or mortar and other building materiel duiig the consti-notion of the building, and the oois may be perma- Leently discoioied or marred by the aiiing ma- '.neiial and troic unless piotecte.

011e frequent source oi" injuiy; to che ooncie'te floors of buildings aiming 1@bhe construc- 'c-o oi buiidiilgs is due .zothe Wet concrete isiiing from the :newly constructed ioor oveiieed onto the ooi below and edhei'iilg iii/cieco, but this dicuicy is entirely overcome by che jgs-esem invention since iaile falling concrete wli adhere to the @epee cover- .iiisead oi the undeiyiiig io-oi @ed is 'feediiy emoyed wich che papes,

Reen'oiceci We'eiprooi Where empioyed iii accordance with Jche piesem invenzion to coreano. pioiect coocfee moy be subjected tremeiy initrd usages since ii; may be covcie with Wei/er oia` :i Wei, muddy mixoi ii and Qoiiciee for e peiod o days ed ihe peper Weile to 'this condition may e subiccted 13o the severe tm'iic on? the Work imikiiig over ies siiiece and hauling maizeiieis iii Wiiceibe-iows oi ceis, .if 'the paper tesis or disiii'cegiees unc-lei this severe 'ciesmeni: oi pemis the dirty wete? to poss iheietiirough, the iiiiiieiying comciete will "ee discoioreii oi: meiiexi, md ii the ieeiiioi'cieg fibeis used izo i'eeiiioice the peper concoioi'iog meister soi'uole m Weei fue coilceze may become sieiled or swiped fom the ifeemzofcimg,l ioeis.,

W either seciiioicezi oi unieemioice,

iciiig che method oi eee present iiiyei'ciozo9 e n forced Wecepeoo'i peper herein shown sind Sail ` of convenient dimension,

described, and which consists of two sheets offpaper reenforced by' unspun fibers laid relatively close together and firmly secured between the sheets of paperby a waterproof adhesive. After the erection of a building having the concretefloors covered with waterproof paper is practically completed, the protecting paper may be removed, whereupon the floors will be found to be `well cured,

clean and ready for use.

If the area o f concrete to be cured is too large to be covered bya sin lewidth of paper en several or any desired number of widths of water-proof paper may be ein loyed, but their adjacent edges should pre erably be laid-in overlapping relation so as to completely cover the vunderlyingA concrete, and these overlapping ed es Ve Aedges of the covering sheet be irmly's'ecured `moisturere portion of the covered floor of Fi in place to prevent their accidental displacement, and also to prevent the wind from entering under the sheet and in up the moisture needed for the proper ydgra ion of the cement. This, however, is readily accomplished by adhesively securing the marginal edgfes of the covering sheet to the concrete sur aee. f

ventionwillfbe further understood from the following description when read -in connection with the accompanying drawings illustrating" one application of the present In, the drawings'zy Fig. 1 is a perspective sectional view fia Fig. 2 is a perspective sectiona view of a room of a building or other structure having enclosing walls, and shows the concreteiloor as covered with` paper in accordance with the present method. e

The method of the present invention is illustrated in the drawings in connection with a building construction havin the concrete floor 10, side walls 11 and en wall 12, and the door is shown as provided with a covering ,formed of the sheetsor strips o paper 13v disposed so that their adjacent edges overlap as shown.

One im rtant object in providing the covering or the concrete area or floor 10 is to confine the moisture in the underlying concrete structure so as to retard its evaporation. The paper covering should therefore be applied tothe concrete shortly after the concrete area is troweled or otherwise worked to present the desired smooth, u' per surface,

and while the inner structure o the concrete still retains a .considerable amount of the water of the-concrete mixture. The paper thereforeshould be placed upon the floor 10 about as soon as the ooncret'e is sulliciently hard to permit the workmen to walk upon its surface without leaving foot prints. This may be the day the concrete is poured ordthe da following. y

e paper in most cases should remain in place'up'on the concrete for from one to several weeks until the slow setting of the concrete is about completed, and as above stated may remain in place for months to rotect the face of the floor 10 from dirt and oreign matter. The paper should therefore be firmly held in place lsofthat it will ,not be displaced by the wind or the trallic over the floor. The overlapping marginal poi-tions of the sheets'ofpaperl are t erefore preferably secured together, and it is desirable to employ an adhesive 14 for this pur` se to form a tight joint between the sheets o paper to retain them in lace and reduce the escape of moisture tween their overlapping ture of `the paper an the water that falls` u n the paper from penetrating theretlg-)ou h to the underlyin concrete, and also to re uce the tendency o the paper to disintegrate under the action of the moisture upon its Vupper and lower faces. It is also The aboveA and other features of the in' desirable to emplo la water-proof adhesive at the joints 14 which will not be softened or otherwise affected by the 'moisture towhich it may be exposed and release the paper, and while variousv water-proof adhesives ma be used excellent results have been obtained through the employment of a water-proof adhesive formed from the viscous, milky substance secured from the rubber plant and which dries atmos here.

quicklywhen lexposed to the It is-important that the outer marginal" edges of the covering sheet of aper be retained in place adjacent the wa 11 and 1 2 so that the aper will not be picked up by the wind or ot erwise displaced, and while these marginal portions ma be held in place by the use of weights, suc as wooden strips, excellent results are obtained by employing the water-proof adhesive above mentioned at the edges of the paper adjacent the walls 11 and 12 to secure the paper to the concrete 10, as indicated by 15.

Asabove stated, reenforced paper is preferably employed to cover the concerte 10 when the paper is to remain in place a relatively long time and is to be subjected to severe wear. The paper of 1 is therefore'y lll neeneee shown es e multiply reenorced peper con sisting of the sheets ci? peper l@ and 17 hsv reenorcing fibres i8 end secured therebetween in e straightened condition by s weter-prooi adhesive such es asphalturu. The reenforcing ibres are preierabl unspun, such es sisal, end ere distributed t rouglwut the suriiece crea of the paper to inipart substantial resistance egelnst teerin strains. Such ,tibres me entend longitudineliy or transversely of t e paper surface or they may extend in both directions,.or in any direction best suited to impart the desired strength to the paper.

The usev ci unspun bres such es sisal to reenorce the peperl not oniy produces en extremely strong, tough and durabie covering sheet, but possesses the further advantage, in that thesev unspun fibres will not stretch appreciebly under tension, nor will they stain or discolor the underlying con-1 crete as will low grade spun libres.

in constructing buildings having concrete floors,`it is the practice in some cases to forni an underlying floor structure of concrete, then after the side walls of the buildin and rooms thereof are finished, a top layer o concrete forming the finished concrete floor is poured over the underlying rough Hoor structure. in other constructions the concrete door is formed in a single operation by laying et one time sufficient concrete to form a floor of the desired final thickness, and when this method is used the various ioors of the 1. The method ci curing concrete by re- E' tarding the evaporation of the moisture from y" the concrete structure., which consists in cov ering the surace of newiy laid concrete that is exposed to the atmosphere with multiply' weterproof paper orrned o two sheets of peper secured together with waterproo adhesive conldned between the sheets so that this adhesive does not come in direct contact with the concrete, end retaining the waterproo paper in place upon the concrete during the concrete curing period.,

2. The method in accordance with claim i wherein the paper sheets are strengthened by a reenforcement confined between the paper sheets by the waterproof adhesive.

3. The method in accordance with claim l. wherein reenforcing filaments ere secured by the waterproof adhesive between the peper sheets to strengthen and prevent rupture of the paper. Y

in testimony whereof, l have signed my name toy this specification.A

ELMER T. ANDERSUN,

building maybe completed before the side walls of the building are constructed, in

which case the floor may be exposed to the weather for a period of many weeks.

The method of the present invention is' well adapted for use in curing the concrete of either of the floor constructions just described, but when used in connection with the letter type of flooring, the paper coverin will be exposed to the wind and rain an therefore should be lfirmly secured in place to prevent its displacement by the free sweep of the Wind..

The multiply reenforced paper shown and described as formed of two sheets of paper adhesively secured together with a waterf prooil adhesive such as asphaltum and reenorced with unspun fibers is extremely tough, strong, and durable and is well adapted to protect and cure concrete oors and other concrete areas in accordance with the present invention.

, Al further advantage is secured through the use of the multiply, waterproofpaper herein shown and described to cure concrete in accordance with the present invention, since this paper is clean'to handle and since the waterproof adhesive such as asphaltum is confined between the two sheets of :iper it does not come in direct contact wit the 

